package cn.itcast.netty.netty.c2;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;

/**
 * className: HelloServer
 * description:
 * date: 2024/6/7-11:01
 * <p>
 * project: netty-demo
 * package: cn.itcast.netty.netty.c2
 * email: 1085844536@qq.com
 * version:
 *
 * @author WangGuojian
 */
public class HelloServer {

    public static void main(String[] args) {
        // 1. 启动器，负责组装 netty 组件，启动服务器
        new ServerBootstrap()
                // 2. BossEventLoop, WorkerEventLoop(selector, thread), group 组
                .group(new NioEventLoopGroup())
                // 3. 选择服务器的 ServerSocketChannel 实现
                .channel(NioServerSocketChannel.class) // OIO BIO
                // 4. boss 负责处理连接 worker(child) 处理处理读写，决定了 worker(child) 能执行哪些操作(handler)
                .childHandler(
                        // 5. channel 代表和客户端进行数据读写的通道 Initializer 初始化，负责添加别的 handler
                        new ChannelInitializer<NioSocketChannel>() {
                            @Override
                            protected void initChannel(NioSocketChannel ch) {
                                // 6. 添加具体 handler
                                ch.pipeline().addLast(new StringDecoder()); // 将 ByteBuf 转换为字符串
                                ch.pipeline().addLast(new ChannelInboundHandlerAdapter() { // 自定义 handler
                                    @Override // 读事件
                                    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                        // 打印上一步转换好的字符串
                                        System.out.println(msg);
                                    }
                                });
                            }
                        })
                // 6. 绑定监听端口
                .bind(8080);
    }
}
